Chemistry Homework Help

Chemistry
Tutor: None Selected Time limit: 1 Day

Q1:

How many moles of a gas are in a balloon that has a volume of 15.9L at a pressure of 149kPa and a temperature of 28C?

Q2:

A sample of carbon dioxide(CO2) has a mass of 55g and occupies 3.3L at 100C. What pressure does the gas exert (in kPa)?

Jun 9th, 2015

Thank you for the opportunity to help you with your question!

In both questions we are going to use the ideal gas law PV=nRT

Q1 : So we have n=(PV)/(RT)

P=149 kPa, V=15.9 L, R=8.314 kPa•L/mol•K and T=273+28=301 K

So n=(149*15.9)/(8.314*301)=0.95 moles

Q2 : We have P=(nRT)/V or n=m/M so P=(mRT)/(M*V)

T=273+100= 373 K and M(CO2)=44 g/mol

P=(55*8.314*373)/(3.3*44)=1,175 kPa

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 9th, 2015

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